Warren Buffett / Berkshire Hathaway Q2 2025 portfolio moves, in summary from the latest Berkshire Hathaway 13-F filingNew and Increased PositionsUnitedHealth Group (UNH) – New 5M-share stake (~US$1.6B value, 18th largest Berkshire position).First time back in UNH since 2010; stock jumped 6–7% in after-hours trading on the news.Purchase comes despite UNH’s troubled year: ~50% share price drop YTD, DOJ investigation into Medicare billing, CEO resignation, and reduced 2025 earnings outlook.Seen as a contrarian bargain move; possibly initiated by investment lieutenants Todd Combs or Ted Weschler.Nucor (NUE) – New position; steelmaker’s shares jumped nearly 8% after disclosure.Lennar (LEN) – Significantly increased stake; shares rose ~3% after filing.DR Horton (DHI) – New position in homebuilder; shares up ~3% after filing.Other smaller stakes – Lamar Advertising (outdoor advertising) and Allegion (security products).Trimmed PositionsApple (AAPL) – Further reduced stake.Bank of America (BAC) – Continued selling.Context & SpeculationBerkshire’s Q1 filing had noted one or more undisclosed holdings under SEC confidential treatment; the “mystery stock” turned out to be a mix of DR Horton, Nucor, and Lennar stakes.Berkshire’s equity portfolio value: ~US$300B.Buffett steps down as Berkshire CEO end-2025; Greg Abel to succeed him and will oversee capital allocation. Buffett remains chairman.Market ImpactUNH, NUE, LEN, and DHI all rallied after the filing.UNH also attracted other notable buyers in Q2, including Michael Burry and David Tepper.UNH trading at a P/E just under 12, near decade-long lows. This article was written by Eamonn Sheridan at investinglive.com.